1 Department of Infectious and Tropical Diseases, The Second Affiliated Hospital of Hainan Medical University, Haikou, China.
2 Department of Infectious Diseases, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
3 Department of Infectious Diseases, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China. Electronic address: zhuchuanlong@jsph.org.cn.